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The formula for calculating the armature resistance (Ra) in a Permanent Magnet DC (PMDC) motor can generally be determined using Ohm’s Law and is based on the resistance of the wires wound around the armature. The formula is given by:
[R_a = frac{V – E}{I}]
Where:
– (R_a) is the armature resistance,
– (V) is the supply voltage,
– (E) is the back emf (Electromotive Force) generated by the motor, and
– (I) is the current flowing through the armature.
To find the armature resistance accurately, you typically measure under static conditions without the motor running to avoid complications from the generated back emf.